Unlockables

You start out just with CommanderVideo (also a female version) and if you play through the worlds you will eventually come across a key vault level.

To get to that level take the alternate route (blue path) while playing through the previous level. Beat it and you will have unlocked all the keys for that level.

Then go back to previous levels that had keys in them. Follow the locked path (which should now be unlocked as long as you grabbed the key in the level) and there will be a chest at the end of the level.